CN113271697B - Double-end intelligent stepless dimming T8 LED lamp tube - Google Patents
Double-end intelligent stepless dimming T8 LED lamp tube Download PDFInfo
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- CN113271697B CN113271697B CN202110471268.3A CN202110471268A CN113271697B CN 113271697 B CN113271697 B CN 113271697B CN 202110471268 A CN202110471268 A CN 202110471268A CN 113271697 B CN113271697 B CN 113271697B
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- 230000008030 elimination Effects 0.000 claims description 16
- 238000003379 elimination reaction Methods 0.000 claims description 16
- 230000003287 optical effect Effects 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 12
- 238000002955 isolation Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 230000006870 function Effects 0.000 description 11
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- 238000010586 diagram Methods 0.000 description 7
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- 230000002159 abnormal effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses a double-end intelligent stepless dimming T8 LED lamp tube, which belongs to the technical field of LED lamps, and comprises a multifunctional constant current unit and an LED lamp panel, wherein the multifunctional constant current unit drives the LED lamp panel, so that the technical problem that the brightness when the switch is turned off last time can be solved in a specified time through the switching action of a conventional switch; the invention has simple structure, obtains an AC end switch signal by sampling AC, inputs the AC end switch signal to the MCU, outputs a PWM signal by software programming, and realizes stepless dimming; the invention adopts the combination of the voltage dividing resistor, the voltage stabilizing tube and the optocoupler to realize the overvoltage protection circuit of the output voltage, and the double-end input of the invention meets the electric leakage protection requirement and has no stroboscopic effect.
Description
Technical Field
The invention belongs to the technical field of LED lamps, and relates to a double-end intelligent stepless dimming T8LED lamp tube.
Background
At present, dimming is usually performed through control of a remote controller or a mobile phone, but if the remote controller is lost, or the mobile phone is powered off, or no network exists, the dimming of the light brightness can not be realized, and inconvenience is brought to use.
Disclosure of Invention
The invention aims to provide a double-end intelligent stepless dimming T8 LED lamp tube, which solves the technical problem that the brightness of the last time of switching off can be realized in a specified time through the switching action of a conventional switch.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A double-end intelligent stepless dimming T8 LED lamp tube comprises a multifunctional constant current unit and an LED lamp panel, wherein the multifunctional constant current unit drives the LED lamp panel;
The multifunctional constant current unit comprises a constant current circuit, a leakage protection circuit, an input rectifying and filtering circuit, an AC sampling and amplitude limiting circuit, an optocoupler U4, a PWM (pulse-width modulation) generation circuit, a stroboscopic elimination circuit, an output overvoltage protection circuit and an auxiliary power supply circuit, wherein the input end of the input rectifying and filtering circuit is connected with mains supply, the output end of the input rectifying and filtering circuit is respectively connected with the AC sampling and amplitude limiting circuit, the leakage protection circuit and the auxiliary power supply circuit, the leakage protection circuit is connected with the constant current circuit, the constant current circuit is connected with the stroboscopic elimination circuit, the stroboscopic elimination circuit drives an LED lamp panel, the LED lamp panel is provided with an anode LED+ and an anode LED-, and the stroboscopic elimination circuit is connected with the anode LED+ and the cathode LED-;
the AC sampling amplitude limiting circuit is connected with the input end of the optical coupler U4, the output end of the optical coupler U4 is connected with the PWM generating circuit, the auxiliary power supply circuit supplies power to the PWM generating circuit, and the PWM generating circuit is connected with the constant current circuit;
the output overvoltage protection circuit is connected with the constant current circuit and is used for collecting the output voltage of the constant current circuit and feeding the output voltage back to the constant current circuit.
Preferably, the input rectifying and filtering circuit is an AC-DC module, and is configured to convert the commercial power into direct current and output the direct current to the AC sampling and limiting circuit, the leakage protection circuit and the auxiliary power supply circuit respectively.
Preferably, the leakage protection circuit comprises a leakage protection chip U1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a voltage stabilizing diode ZD1, a diode D2, a diode D1, a capacitor C1 and a piezoresistor VR1, wherein the output end of the AC-DC module outputs a voltage HV through the diode D1, the 1 pin of the leakage protection chip U1 is connected with the 3 pin of the leakage protection chip U1 through the resistor R3 and the resistor R4, the 1 pin of the leakage protection chip U1 is also connected with the 7 pin of the leakage protection chip U1 through the resistor R1 and the resistor R2, the 7 pin of the leakage protection chip U1 is connected with a first ground wire, the 6 pin of the leakage protection chip U1 is connected with the positive electrode of the diode D2, the negative electrode of the diode D2 is connected with a second ground wire, the resistor R5 is connected with the diode D2 in parallel, the 5 pin of the leakage protection chip U1 is connected with the second ground wire through the capacitor C1, the 4 pin of the leakage protection chip U1 is also connected with the negative electrode of the diode ZD1 through the capacitor C1, the positive electrode of the leakage protection chip ZD1 is connected with the second ground wire, and the negative electrode of the positive electrode of the leakage protection chip ZD1 is connected with the second ground wire through the voltage stabilizing diode 3.
Preferably, the AC sampling limiting circuit includes a zener diode ZD3, a capacitor C7, a resistor R19, a resistor R20 and a resistor R18, where an input end of the AC-DC module is connected to a negative electrode of the zener diode ZD3 through the resistor R18, an positive electrode of the zener diode ZD3 is connected to a second ground line, the capacitor C7 and the resistor R19 are both connected in parallel with the zener diode ZD3, and a negative electrode of the zener diode ZD3 is connected to an input end of the optical coupler U4 through the resistor R20.
Preferably, the PWM generating circuit includes an MCU chip U5, a resistor R21, a capacitor C8, a capacitor C9, and a resistor R22, where an output end of the optocoupler U4 is connected to an IO port of the MCU chip U5, and the resistor R21 is a pull-up resistor of the IO port;
the capacitor C8 is a filter capacitor at the power supply end of the MCU chip U5, the MCU chip U5 outputs PWM signals through the other IO port, and the resistor R22 and the capacitor C9 are respectively a pull-down resistor and a filter capacitor of the IO port;
The PWM signal is output to the constant current circuit.
Preferably, the constant current circuit is a non-isolated step-down constant current circuit and is composed of a constant current source chip and a peripheral circuit thereof, the constant current source chip is a built-in MOSFET and a PWM control circuit, and the voltages output by the output end of the constant current source circuit are respectively the voltage VO & lt+ & gt and the voltage VO & lt+ & gt;
The output overvoltage protection circuit is composed of a voltage dividing resistor circuit and an optocoupler isolation circuit, wherein the voltage dividing resistor circuit is used for collecting output voltage of the constant current circuit, outputting the output voltage to the optocoupler isolation circuit for isolation, and feeding back the output voltage to a constant current source chip in the constant current circuit.
Preferably, the strobe elimination circuit comprises an LED driving chip U3, a resistor R14, a resistor R15, a resistor R16 and a resistor R17, wherein the 1 pin of the LED driving chip U3 is connected with the voltage VO-, the 3 pin is connected with the power supply VO-, the 3 pin is connected with the voltage VO-, the 4 pin is connected with the voltage VO+ through the resistor R17, the 4 pin of the LED driving chip U3 is also connected with the positive pole LED+ of the LED lamp panel through the resistor R14, the 3 pin of the LED driving chip U3 is connected with the negative pole LED-of the LED lamp panel through the resistor R16, and the 5 pin, the 6 pin, the 7 pin and the 8 pin of the LED driving chip are all connected with the negative pole LED-of the LED lamp panel.
Preferably, the connection mode of the LED lamps on the LED lamp panel is full series connection or series-parallel connection, and the model of the LED driving chip U3 is as follows.
Preferably, the auxiliary power supply circuit comprises a driving chip U6, a diode D5, a capacitor C10, an inductor L3, a voltage stabilizing diode ZD4, a capacitor C11 and a resistor R23, wherein the positive electrode of the diode D5 is connected with the voltage HV, the negative electrode of the diode D5 is connected with the input end of the driving chip U6, the capacitor C10 is a filter capacitor of the input end of the driving chip U6, the output end of the driving chip U6 outputs 5V voltage through the inductor L3, the negative electrode of the voltage stabilizing diode ZD4 is connected with the 5V voltage, the positive electrode of the voltage stabilizing diode ZD4 is connected with a first ground wire, the capacitor C11 and the resistor R23 are connected in parallel with the voltage stabilizing diode ZD4, and the 5V voltage supplies power for the PWM generating circuit.
The double-end intelligent stepless dimming T8 LED lamp tube solves the technical problem that the brightness when the switch is turned off last time in a specified time through the switching action of a conventional switch, adopts a double-end power supply mode, does not need to modify a conventional lamp tube circuit, can realize so-called plug and play, greatly increases the replacement convenience, has a leakage protection function, and ensures the use safety.
Drawings
FIG. 1 is a wiring diagram of the present invention;
FIG. 2 is a schematic block diagram of the present invention;
FIG. 3 is a circuit diagram of the leakage protection circuit of the present invention;
FIG. 4 is a circuit diagram of an AC sample limiter circuit of the present invention;
FIG. 5 is a circuit diagram of a PWM generating circuit of the present invention;
FIG. 6 is a circuit diagram of a strobe elimination circuit of the present invention;
fig. 7 is a circuit diagram of the auxiliary power supply circuit of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
1-7, The double-end intelligent stepless dimming T8 LED lamp tube comprises a multifunctional constant current unit and an LED lamp panel, wherein the multifunctional constant current unit drives the LED lamp panel;
The multifunctional constant current unit comprises a constant current circuit, a leakage protection circuit, an input rectifying and filtering circuit, an AC sampling and amplitude limiting circuit, an optocoupler U4, a PWM (pulse-width modulation) generation circuit, a stroboscopic elimination circuit, an output overvoltage protection circuit and an auxiliary power supply circuit, wherein the input end of the input rectifying and filtering circuit is connected with mains supply, the output end of the input rectifying and filtering circuit is respectively connected with the AC sampling and amplitude limiting circuit, the leakage protection circuit and the auxiliary power supply circuit, the leakage protection circuit is connected with the constant current circuit, the constant current circuit is connected with the stroboscopic elimination circuit, the stroboscopic elimination circuit drives an LED lamp panel, the LED lamp panel is provided with an anode LED+ and an anode LED-, and the stroboscopic elimination circuit is connected with the anode LED+ and the cathode LED-;
the AC sampling amplitude limiting circuit is connected with the input end of the optical coupler U4, the output end of the optical coupler U4 is connected with the PWM generating circuit, the auxiliary power supply circuit supplies power to the PWM generating circuit, and the PWM generating circuit is connected with the constant current circuit;
the output overvoltage protection circuit is connected with the constant current circuit and is used for collecting the output voltage of the constant current circuit and feeding the output voltage back to the constant current circuit.
Preferably, the input rectifying and filtering circuit is an AC-DC module, and is configured to convert the commercial power into direct current and output the direct current to the AC sampling and limiting circuit, the leakage protection circuit and the auxiliary power supply circuit respectively.
Preferably, the leakage protection circuit includes a leakage protection chip U1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a voltage stabilizing diode ZD1, a diode D2, a diode D1, a capacitor C1 and a varistor VR1, wherein an output end of the AC-DC module outputs a voltage HV through the diode D1, as shown in fig. 3, an anode of the diode D1 is connected with an output end of the AC-DC module, a cathode outputs the voltage HV, a1 foot of the leakage protection chip U1 is connected with a3 foot of the leakage protection chip U1 through the resistor R3 and the resistor R4, a1 foot of the leakage protection chip U1 is also connected with a 7 foot of the leakage protection chip U1 through the resistor R1 and the resistor R2, a 7 foot of the leakage protection chip U1 is connected with a first ground wire, a 6 foot of the leakage protection chip U1 is connected with an anode of the diode D2, a cathode of the diode D2 is connected with a second ground wire, a resistor R5 is connected with a 5 foot of the leakage protection chip U1 is connected with the second ground wire, a 4 foot of the leakage protection chip U1 is connected with a cathode of the diode D1 through the capacitor D1, and a 4 foot of the leakage protection chip is connected with a second ground wire through the diode ZD 1.
In this embodiment, the working voltage VCC is provided to the U1 pin 4 after the voltage is reduced by the resistor R1 and filtered by the capacitor C1, and the voltage regulator ZD1 is added to ensure that the working voltage of the U1 is within the effective range. U1 pins 7 and 6 are respectively the drain electrode and the source electrode of the internal MOSFET; the resistor R5 is used for detecting the passing current value; the resistors R2 and R4 form a voltage dividing circuit, and the voltage dividing value is input to the pin 2 of the U1 through the resistor R3 and used for detecting the loop voltage value. The leakage protection circuit adopts an impedance method to detect leakage current, and the impedance method is a method for detecting the power grid impedance Zs in real time and judging whether the power grid impedance Zs of the lamp tube access point is lower than a set value Zref. If Zs < Zref, judging that the power grid is normal, closing a switch, and normally switching on a lamp tube; if Zs > Zref, the power grid is judged to be abnormal (if a human body is accessed), and the switch is opened until the power grid impedance is recovered to be normal. Whether the leakage current tested exceeded 5.0m.i.u. In the invention, the first ground wire and the second ground wire are both connected with the U1 ground; all circuit grounds of the later stage are connected with the pin 7 of the U1, the connection relation of the ground is ensured to be correct, otherwise, the leakage current protection cannot ensure that the leakage current is less than 5.0M.I.U.
Preferably, the AC sampling limiting circuit includes a zener diode ZD3, a capacitor C7, a resistor R19, a resistor R20 and a resistor R18, where an input end of the AC-DC module is connected to a negative electrode of the zener diode ZD3 through the resistor R18, an positive electrode of the zener diode ZD3 is connected to a second ground line, the capacitor C7 and the resistor R19 are both connected in parallel with the zener diode ZD3, and a negative electrode of the zener diode ZD3 is connected to an input end of the optical coupler U4 through the resistor R20.
As shown in fig. 4, one end of the resistor R18 is connected to one input terminal of the AC-DC module, and in this embodiment, to the N input terminal, i.e., the zero line input terminal.
The resistors R18 and R19 and a rectifier diode in the AC-DC module form an AC half-wave voltage reduction circuit, the AC half-wave voltage reduction circuit is filtered by a capacitor C7 to obtain a basic voltage at two ends of a voltage stabilizing tube ZD3, the voltage value is determined by the voltage division of the resistors R18 and R19, and the voltage is isolated by a resistor R20 and an optocoupler U4 and then sent to a later-stage circuit.
Preferably, the PWM generating circuit includes an MCU chip U5, a resistor R21, a capacitor C8, a capacitor C9, and a resistor R22, where an output end of the optocoupler U4 is connected to an IO port of the MCU chip U5, and the resistor R21 is a pull-up resistor of the IO port;
In this embodiment, the MCU chip U5 employs an ARM controller.
The capacitor C8 is a filter capacitor at the power supply end of the MCU chip U5, the MCU chip U5 outputs PWM signals through the other IO port, and the resistor R22 and the capacitor C9 are respectively a pull-down resistor and a filter capacitor of the IO port;
The PWM signal is output to the constant current circuit.
The U5 pin 1 (VCC) end of the MCU chip provides 5V working voltage through an external auxiliary power supply; the capacitor C8 is a bypass capacitor of the MCU chip U5 VCC; the pin 3 of the MCU chip U5 receives a sampling signal from the collector end of the front-stage optical coupler U4, and the resistor R21 provides basic working current for the collector of the optical coupler U4. When the switch is ON, the U5 pin 3 of the MCU chip receives the about 5V trigger signal generated by the previous step-down circuit, and drives the internal program to start to operate. MCU chip U5 functional logic description: when the wall switch is ON, the MCU is powered ON, and outputs two paths of PWM signals (PWM 1 and PWM2 signals are mutually inverted), the lamp is turned ON, the brightness is slowly changed from 0% to 100%, the change time is about 5 seconds from 0% to 100%, if the brightness is changed at a certain time in 0 to 5 seconds, the OFF switch is turned ON, and U5 memorizes the brightness at the time of OFF (for example, when the ON switch is turned ON for 3S, the OFF switch and the PWM outputs 60%). When the switch is turned ON again within 3 seconds after the OFF switch, the brightness of the last OFF time of the switch is memorized. If the power-OFF time of the OFF switch is more than or equal to 3S and then the ON switch is started again by the reset output (PWM 1 is 0% -100% and PWM2 is 100% -0%), the logic definition is cycled and reciprocated. The output PWM signal has a frequency of about 1KHz. Capacitor C9 and resistor R22 are filter elements of pin 7 of U5. The PWM signal is output through the resistor R24, and the amplitude of the output PWM signal can be appropriately adjusted due to the series connection of the resistor R24.
Preferably, the constant current circuit is a non-isolated step-down constant current circuit and is composed of a constant current source chip and a peripheral circuit thereof, the constant current source chip is a control circuit such as a built-in MOSFET (metal oxide semiconductor field effect transistor) and PWM (pulse width modulation), and the voltage output by the output end of the constant current source circuit is a voltage VO-and a voltage VO+;
The non-isolated step-down constant current circuit formed by the control circuits such as the MOSFET and the PWM is not described in detail because of the prior art.
The output overvoltage protection circuit is composed of a voltage dividing resistor circuit and an optocoupler isolation circuit, wherein the voltage dividing resistor circuit is used for collecting output voltage of the constant current circuit, outputting the output voltage to the optocoupler isolation circuit for isolation, and feeding back the output voltage to a constant current source chip in the constant current circuit.
The output overvoltage protection circuit is used for preventing the output voltage from being overvoltage.
Preferably, the strobe elimination circuit comprises an LED driving chip U3, a resistor R14, a resistor R15, a resistor R16 and a resistor R17, wherein the 1 pin of the LED driving chip U3 is connected with the voltage VO-, the 3 pin is connected with the power supply VO-, the 3 pin is connected with the voltage VO-, the 4 pin is connected with the voltage VO+ through the resistor R17, the 4 pin of the LED driving chip U3 is also connected with the positive pole LED+ of the LED lamp panel through the resistor R14, the 3 pin of the LED driving chip U3 is connected with the negative pole LED-of the LED lamp panel through the resistor R16, and the 5 pin, the 6 pin, the 7 pin and the 8 pin of the LED driving chip are all connected with the negative pole LED-of the LED lamp panel.
In this embodiment, the pin 4 (HV) end of the LED driving chip U3 is connected to the vo+ end of the front stage through a resistor R14; resistor R14 is also provided to reduce U3 power consumption and to increase U3 surge resistance. The U3 pins 5,6,7 and 8 of the LED driving chip are the leading-out pins of the internal MOSFET, the negative electrode of the LED load is connected to the LED driving chip, and a working loop is formed from the ends of LED+ to LED-to U3 pin 1 (CS) to VO-. The resistor R15 is used for setting the output current limiting function; the resistors R16 and R17 set the voltage value of the FB terminal, and the strobe removing function is realized by controlling the DRAIN voltage of U3.
Preferably, the connection mode of the LED lamps on the LED lamp panel is full serial connection or serial-parallel connection, and the model of the LED driving chip U3 is BP5656D SOP8.
Preferably, the auxiliary power supply circuit comprises a driving chip U6, a diode D5, a capacitor C10, an inductor L3, a voltage stabilizing diode ZD4, a capacitor C11 and a resistor R23, wherein the positive electrode of the diode D5 is connected with the voltage HV, the negative electrode of the diode D5 is connected with the input end of the driving chip U6, the capacitor C10 is a filter capacitor of the input end of the driving chip U6, the output end of the driving chip U6 outputs 5V voltage through the inductor L3, the negative electrode of the voltage stabilizing diode ZD4 is connected with the 5V voltage, the positive electrode of the voltage stabilizing diode ZD4 is connected with a first ground wire, the capacitor C11 and the resistor R23 are connected in parallel with the voltage stabilizing diode ZD4, and the 5V voltage supplies power for the PWM generating circuit.
The model of the driving chip U6 is BP8519C and SOT23-5.
In this embodiment, the driving chip U6 is a voltage-reducing power supply driving chip dedicated for an intelligent module, and is suitable for non-isolated application occasions; the chip adopts a plurality of patent control technologies, so that the system architecture is simplified to the greatest extent. The driving chip U6 works in an inductive current continuous mode, and compared with a current discontinuous mode, the peak current is smaller, the effective current is smaller, so that the device loss is lower, and the system efficiency is higher. The driving chip U6 integrates high-voltage starting and high-voltage power supply functions, and a starting resistor or a power supply winding is not needed. The driving chip U6 also integrates perfect protection functions, including cycle-by-cycle overcurrent protection of input current, open-circuit protection of a current detection pin, over-temperature regulation function of the driving chip U6, output end short-circuit protection and the like. HV voltage formed by high voltage after front-stage rectification is isolated by a diode D5, and C10 energy storage supplies power to U6 pins 5 and 6 (the Drain poles of internal MOSFET tubes); the U6 internal MOSFET is connected with the inductor L3 through the pin 7, the electrolytic capacitor C11 stores energy, the voltage stabilizing tube ZD4 stabilizes voltage, and the required auxiliary voltage 5V is output. Resistor R23 is the bleed resistance of capacitor C11. The main purpose of adding D5 is to isolate the capacitor C10 from the pre-stage circuit (4) and prevent a serious drop in the PF value.
The double-end intelligent stepless dimming T8 LED lamp tube solves the technical problem that the brightness when the switch is turned off last time in a specified time by the switching action of a conventional switch, adopts a double-end power supply mode, does not need to modify a conventional lamp tube circuit, can realize so-called plug and play, greatly increases the convenience of replacement, has a leakage protection function, and ensures the use safety; the invention has simple structure, obtains an AC end switch signal by sampling AC, inputs the AC end switch signal to the MCU, outputs a PWM signal by software programming, and realizes stepless dimming; the invention adopts the combination of the voltage dividing resistor, the voltage stabilizing tube and the optocoupler to realize the overvoltage protection circuit of the output voltage, and the double-end input of the invention meets the electric leakage protection requirement and has no stroboscopic effect.
In the present invention, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiment of the present invention.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. The utility model provides a bi-polar intelligence stepless dimming T8 LED fluorescent tube which characterized in that: the LED lamp panel is driven by the multifunctional constant current unit;
The multifunctional constant current unit comprises a constant current circuit, a leakage protection circuit, an input rectifying and filtering circuit, an AC sampling and amplitude limiting circuit, an optocoupler U4, a PWM (pulse-width modulation) generation circuit, a stroboscopic elimination circuit, an output overvoltage protection circuit and an auxiliary power supply circuit, wherein the input end of the input rectifying and filtering circuit is connected with mains supply, the output end of the input rectifying and filtering circuit is respectively connected with the AC sampling and amplitude limiting circuit, the leakage protection circuit and the auxiliary power supply circuit, the leakage protection circuit is connected with the constant current circuit, the constant current circuit is connected with the stroboscopic elimination circuit, the stroboscopic elimination circuit drives an LED lamp panel, the LED lamp panel is provided with an anode LED+ and an anode LED-, and the stroboscopic elimination circuit is connected with the anode LED+ and the cathode LED-;
the AC sampling amplitude limiting circuit is connected with the input end of the optical coupler U4, the output end of the optical coupler U4 is connected with the PWM generating circuit, the auxiliary power supply circuit supplies power to the PWM generating circuit, and the PWM generating circuit is connected with the constant current circuit;
the output overvoltage protection circuit is connected with the constant current circuit and is used for collecting the output voltage of the constant current circuit and feeding back the output voltage to the constant current circuit;
The PWM generating circuit comprises an MCU chip U5, a resistor R21, a capacitor C8, a capacitor C9 and a resistor R22, wherein the output end of the optical coupler U4 is connected with an IO port of the MCU chip U5, and the resistor R21 is a pull-up resistor of the IO port; the pin 3 of the MCU chip U5 receives a sampling signal from the collector electrode end of the front-stage optical coupler U4, and the resistor R21 provides basic working current for the collector electrode of the optical coupler U4; when the switch is ON, the U5 pin 3 of the MCU chip receives a 5V trigger signal generated by the front-stage voltage dividing circuit, and drives the internal program to start to operate; MCU chip U5 functional logic description: when the wall switch is ON, the MCU is electrified to output two paths of PWM signals, the lamp is turned ON, the brightness is slowly changed from 0% -100%, the change time is about 5 seconds from 0% -100%, if at a certain moment in the brightness change of 0-5 seconds, the switch is turned OFF, and the U5 memorizes the brightness at the moment of OFF; when the switch is turned ON again within 3 seconds after the switch is turned OFF, the brightness of the switch when the switch is turned OFF last time is memorized; if the power-OFF time of the OFF switch is more than or equal to 3S and then the ON switch, the reset output of the MCU is restarted, and the logic definition is cycled.
2. The double-ended intelligent stepless dimming T8 LED tube of claim 1, wherein: the input rectifying and filtering circuit is an AC-DC module and is used for converting commercial power into direct current and then outputting the direct current to the AC sampling limiting circuit, the leakage protection circuit and the auxiliary power supply circuit respectively.
3. The double-ended intelligent stepless dimming T8 LED tube of claim 2, wherein: the leakage protection circuit comprises a leakage protection chip U1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a voltage stabilizing diode ZD1, a diode D2, a diode D1, a capacitor C1 and a piezoresistor VR1, wherein the output end of the AC-DC module outputs voltage HV through the diode D1, the 1 pin of the leakage protection chip U1 is connected with the 3 pin of the leakage protection chip U1 through the resistor R3 and the resistor R4, the 1 pin of the leakage protection chip U1 is also connected with the 7 pin of the leakage protection chip U1 through the resistor R1 and the resistor R2, the 7 pin of the leakage protection chip U1 is connected with a first ground wire, the 6 pin of the leakage protection chip U1 is connected with the positive electrode of the diode D2, the negative electrode of the diode D2 is connected with a second ground wire, the resistor R5 is connected with the diode D2 in parallel, the 5 pin of the leakage protection chip U1 is connected with the second ground wire through the capacitor C1, the 4 pin of the leakage protection chip U1 is also connected with the negative electrode of the voltage stabilizing diode ZD1 through the resistor C1, and the positive electrode of the voltage stabilizing diode ZD1 is connected with the negative electrode of the voltage stabilizing diode ZD 1.
4. The double-ended intelligent stepless dimming T8 LED tube of claim 3, wherein: the AC sampling amplitude limiting circuit comprises a voltage stabilizing diode ZD3, a capacitor C7, a resistor R19, a resistor R20 and a resistor R18, wherein the input end of the AC-DC module is connected with the negative electrode of the voltage stabilizing diode ZD3 through the resistor R18, the positive electrode of the voltage stabilizing diode ZD3 is connected with a second ground wire, the capacitor C7 and the resistor R19 are connected with the voltage stabilizing diode ZD3 in parallel, and the negative electrode of the voltage stabilizing diode ZD3 is connected with the input end of the optocoupler U4 through the resistor R20.
5. The double-ended intelligent stepless dimming T8 LED lamp tube as claimed in claim 4, wherein: the PWM generating circuit comprises an MCU chip U5, a resistor R21, a capacitor C8, a capacitor C9 and a resistor R22, wherein the output end of the optocoupler U4 is connected with an IO port of the MCU chip U5, and the resistor R21 is a pull-up resistor of the IO port;
the capacitor C8 is a filter capacitor at the power supply end of the MCU chip U5, the MCU chip U5 outputs PWM signals through the other IO port, and the resistor R22 and the capacitor C9 are respectively a pull-down resistor and a filter capacitor of the IO port;
The PWM signal is output to the constant current circuit.
6. The double-ended intelligent stepless dimming T8 LED lamp tube as claimed in claim 5, wherein: the constant current circuit is a non-isolated voltage-reducing constant current circuit and is composed of a constant current source chip and a peripheral circuit thereof, the constant current source chip is a built-in MOSFET and a PWM control circuit, and the voltages output by the output end of the constant current circuit are respectively voltage VO-and voltage VO+;
The output overvoltage protection circuit is composed of a voltage dividing resistor circuit and an optocoupler isolation circuit, wherein the voltage dividing resistor circuit is used for collecting output voltage of the constant current circuit, outputting the output voltage to the optocoupler isolation circuit for isolation, and feeding back the output voltage to a constant current source chip in the constant current circuit.
7. The double-ended intelligent stepless dimming T8 LED lamp tube as claimed in claim 6, wherein: the stroboscopic elimination circuit comprises an LED driving chip U3, a resistor R14, a resistor R15, a resistor R16 and a resistor R17, wherein a 1 pin of the LED driving chip U3 is connected with the voltage VO-3 through the resistor R15, the 3 pin is connected with the voltage VO-3 through the resistor R17, the 4pin is connected with the voltage VO-4 through the resistor R14, the 4pin of the LED driving chip U3 is also connected with an anode LED+ of an LED lamp panel through the resistor R14, the 3 pin of the LED driving chip U3 is connected with a cathode LED-of the LED lamp panel through the resistor R16, and the 5 pin, the 6 pin, the 7 pin and the 8 pin of the LED driving chip are all connected with the cathode LED-of the LED lamp panel.
8. The double-ended intelligent stepless dimming T8 LED tube of claim 7, wherein: the LED lamps on the LED lamp panels are connected in a full series or series-parallel mixed mode.
9. The double-ended intelligent stepless dimming T8 LED tube of claim 7, wherein: the auxiliary power supply circuit comprises a driving chip U6, a diode D5, a capacitor C10, an inductor L3, a voltage stabilizing diode ZD4, a capacitor C11 and a resistor R23, wherein the positive electrode of the diode D5 is connected with the voltage HV, the negative electrode of the diode D5 is connected with the input end of the driving chip U6, the capacitor C10 is a filter capacitor of the input end of the driving chip U6, the output end of the driving chip U6 outputs 5V voltage through the inductor L3, the negative electrode of the voltage stabilizing diode ZD4 is connected with the 5V voltage, the positive electrode of the voltage stabilizing diode ZD4 is connected with a first ground wire, the capacitor C11 and the resistor R23 are connected with the voltage stabilizing diode ZD4 in parallel, and the 5V voltage is used for supplying power to the PWM generating circuit.
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| CN201541386U (en) * | 2009-10-20 | 2010-08-04 | 秦兵 | Remote-control and key dimming energy-saving lamp |
| US11284487B2 (en) * | 2018-11-01 | 2022-03-22 | Xiamen Eco Lighting Co. Ltd. | LED driving circuit |
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| JP2013077390A (en) * | 2011-09-29 | 2013-04-25 | Shinko Denso Co Ltd | Driving circuit of straight tube type led lamp |
| WO2013078669A1 (en) * | 2011-12-02 | 2013-06-06 | Ye Jun | Led drive circuit and led drive chip |
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